import re
import urlparse

from bs4 import BeautifulSoup


class HtmlParser(object):
    def parse(self, page_url, html_cont):
        if page_url is None or html_cont is None:
            return

        soup = BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8')

        new_urls = self._get_new_urls(page_url,soup)

        new_data = self._get_new_data(page_url,soup)

        return new_urls,new_data

    def _get_new_urls(self, page_url, soup):
        new_urls = set()
        links = soup.find_all('a',href=re.compile(r"/item/"))
        for link in links:
            new_url = link['href']
            new_full_url = urlparse.urljoin(page_url,new_url)
            new_urls.add(new_full_url)
        return new_urls


    def _get_new_data(self, page_url, soup):
        res_data = {}
        res_data['url'] = page_url
        title_node = soup.find('dd',class_='lemmaWgt-lemmaTitle-title').find('h1')

        res_data['title'] = title_node.get_text()

        summary_node = soup.find('div',class_='lemma-summary')
        res_data['summary'] = summary_node.get_text()

        return res_data
